Was there a reason?
Chicks should only be taken after three weeks (21 days) at least, of the parents caring for them. If the hen did not care for any of the chicks, then do not breed her again. If she was caring for the chicks but you took them, next time, leave them with her for three weeks so she can care for them, this will reduce chances of problems and getting sick.
Are the rest of the clutch eating ok? Did they also get sick?
Now he is eating every 2 to 3 hour but very less (about 2 cc)
Your bird should be eating 4 times a day right now. Each time he should eat 10% of his body weight. So, for example, if he weighs 30g, he should eat 3cc - if he wants more, you can give it.
Over night the crop should be allowed to empty completely, so first feed of the day is always to a chick with empty crop.
If you offer too many feeds, they will eat less quantity.
What temperature are you feeding the food? If it is too cold, they won´t want it and will only eat a small amount before pulling away. They are like goldilocks, it needs to be just right.
He is on medication for digestion.
This medicine could make him have less appetite. What is the medicine called?
Where are the chicks being kept? What temp is the brooder? What bedding do you have?
Maybe you could upload a photo of the set up?
It is very difficult to help when there is so little information. If you post some more info, we can help with more tips.
